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Bird Quizz (RV)

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Thu Jul 19, 2012 7:10 pm Unread post
:hmz:
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Re: Bird Quizz (RV)

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Fri Jul 20, 2012 8:44 am Unread post
Pied babbler ?


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Sat Jul 21, 2012 12:59 am Unread post
Penguins?


Re: Bird Quizz (RV)

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Sat Jul 21, 2012 6:31 am Unread post
I think it is some or other water bird like a coot or something.


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Sun Aug 05, 2012 8:57 pm Unread post
Hi all :yaya:
Been a while. Got tangled up in the rat race.
Think big on the birds :wink:


Re: Bird Quizz (RV)

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Sun Aug 05, 2012 11:37 pm Unread post
Ostrich


Re: Bird Quizz (RV)

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Tue Aug 07, 2012 8:29 pm Unread post
Well done Imberbe! You are it. . .


Re: Bird Quizz (RV)

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Tue Aug 07, 2012 9:12 pm Unread post
:dance:

I will not be able to post for a few days ...

First to post is IT!


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Wed Aug 08, 2012 9:06 am Unread post
Why do birds of prey spiral when moving in an upward direction in the sky?


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Wed Aug 08, 2012 9:58 am Unread post
onewithnature wrote
Why do birds of prey spiral when moving in an upward direction in the sky?


To stay in the hot wind currents that goes upwards.


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Fri Aug 10, 2012 12:48 am Unread post
Yes, Rooies, but then why spiral - why not just float upwards on extended wings?


Re: Bird Quizz (RV)

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Fri Aug 10, 2012 8:18 am Unread post
I will take a wild guess here. The updrafts doesn't stay in the same place and moves constantly. The birds must go in circles to test and exploit the best currents.


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Sat Aug 11, 2012 6:36 am Unread post
Intelligent guess, Rooies, but not exactly correct.


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Tue Aug 21, 2012 11:18 pm Unread post
The updraft can be likened to a bubble of air which is created when you boil water. The bubble starts at the bottom and then moves upward, eventually detaching itself from the area where it started. It can also move horisontally across the landscape at the same time.

Though it is much bigger than the boiling water bubble, it remains rather confined and the birds needs to keep within this updraft to get the lift. To achieve this, it needs to spiral within the bubble. Some birds are not able to spiral in such a confined space and can therefore not use the updrafts effectively.


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Wed Aug 22, 2012 1:18 am Unread post
IB :clap: :clap: :thumbs_up:
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